Acid Yellow 42 CAS# 6375-55-9

Acid Yellow 42 (CAS 6375-55-9) is an acid dye. Other names include Acid Golden Yellow R, Acid Yellow 42 (Weak Acid Golden Yellow MR), 4,4′-di((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-(1,1′-biphenyl)-2,2′-disulfonic acid disodium salt, Weak Acid Golden Yellow C-R, etc.
Its molecular formula is C_{32} H_{24} N_{8} Na_{2} O_{8} S_{2}, and its molecular weight is 758.6913. It has a bright yellow powder appearance and is easily soluble in water.
Acid Yellow 42 can be used for dyeing a variety of materials, such as nylon island microfiber leather fabrics. In the composite dyes of nylon island microfiber leather fabrics, the composite dyes composed of it and reactive dyes can achieve consistent dyeing effects on PU and nylon microfibers, with good dye penetration and leveling properties, which can make the fabric effect more uniform. In addition, Acid Yellow 42 can also be used as a colorant in the production of some three-in-one crayons.
When using Acid Yellow 42 or products containing this dye, it is necessary to follow the relevant safety regulations and operating guidelines to ensure safety.